Thickened Environment Material, High Toughness, It Is Made Of High Quality Rain Grade Material, Not Afraid Of Tearing. Smooth Inner Ring Without Burrs, Does Not Harm The Skin, Seamless Edge Sealing, With A Bonding Width Of Nearly One Centimeter And Seamless Edge Sealing. Safety Air Bag, The Air Bag Of The Independent Air Chamber Is Designed With A Large Degree Of Space To Improve The Safety Of The Swimming Circle. Internal And External Double Anti-Leakage Design, Even If The External Air Nozzle Is Accidentally Opened, It Will Only Leak Slowly.